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(2020) Qun Li et al.   NEW ENGLAND JOURNAL OF MEDICINE

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Safety and Immunogenicity of SARS-CoV-2 mRNA-1273 Vaccine in Older Adults

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Safety and efficacy of the ChAdOx1 nCoV-19 vaccine (AZD1222) against SARS-CoV-2: an interim analysis of four randomised controlled trials in Brazil, South Africa, and the UK

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